build: require alsa libs not older than 6 years

Some IEC958 flags we use have been introduced in 2008, which makes
compilation fail on older systems.

1 files changed, 1 insertions, 1 deletions

diff --git a/wscript b/wscript
index 7e82038aee..2813ecb8a4 100644
--- a/wscript
+++ b/wscript
@@ -539,7 +539,7 @@ audio_output_features = [
     }, {
         'name': '--alsa',
         'desc': 'ALSA audio output',
-        'func': check_pkg_config('alsa'),
+        'func': check_pkg_config('alsa >= 1.0.18'),
     }, {
         'name': '--coreaudio',
         'desc': 'CoreAudio audio output',